From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephan Schmitt <drmabuse@cs.tu-berlin.de>
Subject: Re: $LR syntax in tables
Date: Wed, 12 Aug 2009 18:39:02 +0200
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To: emacs-orgmode@gnu.org, Andrew Stribblehill <ads@wompom.org>


Stephan wrote:
> Andrew wrote:
>> I'm afraid I can't quite wrap my head around this puzzle. I have a 
>> little table:
>>
>> | Budget       |  640 | 640 |
>> | Some expense | -165 | 475 |
>>   #+TBLFM: $3=$LR3+$2
>>
>> So col C is supposed to add the previous line's col C to the current
>> line's col B.
>>
>> However, it seems that $LR3 is referring to the _subsequent_ line not
>> the previous one. Is there a bug or just my misunderstanding?
>>
>> Thanks.
> 
> Hi Andrew,
> 
> what you need is this:
> 
> |              |      |   0 |
> | Budget       |  640 | 640 |
> | Some expense | -165 | 475 |
> #+TBLFM: $3=@-1+$2::@1$3=0
> 
> the LR-reference is for the last, that is, the bottom row.
> 
> You need the first row and the field formula for C1 in order to 
> initialize the cumulative sum properly.
> 
> hth,
>     Stephan
> 

p.s.
another solution would be:

| Budget       |  640 |  640 |
| Some expense | -165 | -165 |
#+TBLFM: $3=@-1+$2::@1$3=@1$2

Greetings,
	Stephan